2151819556 has 24 divisors (see below), whose sum is σ = 3967576704. Its totient is φ = 1019135040.

The previous prime is 2151819529. The next prime is 2151819589. The reversal of 2151819556 is 6559181512.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104065 + ... + 123016.

It is an arithmetic number, because the mean of its divisors is an integer number (165315696).

Almost surely, 2^2151819556 is an apocalyptic number.

It is an amenable number.

2151819556 is a deficient number, since it is larger than the sum of its proper divisors (1815757148).

2151819556 is a wasteful number, since it uses less digits than its factorization.

2151819556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227211 (or 227209 counting only the distinct ones).

The product of its digits is 108000, while the sum is 43.

The square root of 2151819556 is about 46387.7091048911. The cubic root of 2151819556 is about 1291.0268762093.

The spelling of 2151819556 in words is "two billion, one hundred fifty-one million, eight hundred nineteen thousand, five hundred fifty-six".